Face mask cushion



FIG. 1 is a top, front and left side perspective view of a face mask cushion embodying our new design;

FIG. 2 is a top, rear and left side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

Broken lines are used to depict portions of the face mask cushion which form no part of the claimed design. 

CLAIM The ornamental design for a face mask cushion, as shown and described. 